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Cauldron vs Readeck: catalog facts
Cauldron	Readeck
Free Free and open source under the Apache-2.0 licence; requires an Instapaper account.	Free No paid tier is mentioned; you run it on your own server.
Linux	Web, Self-hosted, Browser extension
Native GTK interface for GNOME Reads saved Instapaper articles outside the browser	Highlights, labels, favorites and full-text search across saved content Saves video transcripts as readable, searchable text
Only works with Instapaper Linux only	You need to host and maintain the server yourself Transcripts are only saved when the video provides one
Downloadable app	Self-hosted, Browser extension
Open source	Open source
License: Apache-2.0	License not stated
Account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.